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Reports local variables declared in one branch of a <code>switch</code> statement
and used in another branch. Such declarations can be extremely confusing.
<p>Example:</p>
<pre><code>
    switch(i) {
      case 2:
          int x = 0;
          break;
      case 3:
          x = 3;
          System.out.println(x);
          break;
    }
</code></pre>
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